source/erf-dag: compiler warnings

Bug: #6667.

Fix compiler warnings for function pointer parameters missing const with --enable-dag

src/source-erf-dag.c

@@ -118,10 +118,10 @@ static inline TmEcode ProcessErfDagRecords(ErfDagThreadVars *ewtn, uint8_t *top,
     uint32_t *pkts_read);
 static inline TmEcode ProcessErfDagRecord(ErfDagThreadVars *ewtn, char *prec);
 TmEcode ReceiveErfDagLoop(ThreadVars *, void *data, void *slot);
-TmEcode ReceiveErfDagThreadInit(ThreadVars *, void *, void **);
+TmEcode ReceiveErfDagThreadInit(ThreadVars *, const void *, void **);
 void ReceiveErfDagThreadExitStats(ThreadVars *, void *);
 TmEcode ReceiveErfDagThreadDeinit(ThreadVars *, void *);
-TmEcode DecodeErfDagThreadInit(ThreadVars *, void *, void **);
+TmEcode DecodeErfDagThreadInit(ThreadVars *, const void *, void **);
 TmEcode DecodeErfDagThreadDeinit(ThreadVars *tv, void *data);
 TmEcode DecodeErfDag(ThreadVars *, Packet *, void *);
 void ReceiveErfDagCloseStream(int dagfd, int stream);
@@ -175,8 +175,7 @@ TmModuleDecodeErfDagRegister(void)
  * \param data      data pointer gets populated with
  *
  */
-TmEcode
-ReceiveErfDagThreadInit(ThreadVars *tv, void *initdata, void **data)
+TmEcode ReceiveErfDagThreadInit(ThreadVars *tv, const void *initdata, void **data)
 {
     SCEnter();
     int stream_count = 0;
@@ -196,14 +195,14 @@ ReceiveErfDagThreadInit(ThreadVars *tv, void *initdata, void **data)
      */
     if (dag_parse_name(initdata, ewtn->dagname, DAGNAME_BUFSIZE,
             &ewtn->dagstream) < 0) {
-        SCLogError("Failed to parse DAG interface: %s", (char *)initdata);
+        SCLogError("Failed to parse DAG interface: %s", (const char *)initdata);
         SCFree(ewtn);
         exit(EXIT_FAILURE);
     }
 
     ewtn->livedev = LiveGetDevice(initdata);
     if (ewtn->livedev == NULL) {
-        SCLogError("Unable to get %s live device", (char *)initdata);
+        SCLogError("Unable to get %s live device", (const char *)initdata);
         SCFree(ewtn);
         SCReturnInt(TM_ECODE_FAILED);
     }
@@ -612,8 +611,7 @@ DecodeErfDag(ThreadVars *tv, Packet *p, void *data)
     SCReturnInt(TM_ECODE_OK);
 }
 
-TmEcode
-DecodeErfDagThreadInit(ThreadVars *tv, void *initdata, void **data)
+TmEcode DecodeErfDagThreadInit(ThreadVars *tv, const void *initdata, void **data)
 {
     SCEnter();
     DecodeThreadVars *dtv = NULL;